Pt<sup>II</sup>-Mediated 1,3-Dipolar Cycloaddition of Oxazoline <i>N</i>-Oxides to Nitriles as a Key Step to Dihydrooxazolo-1,2,4-oxadiazoles
作者:Anastassiya V. Makarycheva-Mikhailova、Julia A. Golenetskaya、Nadezhda A. Bokach、Irina A. Balova、Matti Haukka、Vadim Yu. Kukushkin
DOI:10.1021/ic701133b
日期:2007.10.1
and 13C1H} NMR spectroscopies, and X-ray diffraction (for 1, 2, 5, and 9). With the exception of benzonitrile complexes, 1,3-DCA of oxazoline N-oxides to the PtII-ligated nitriles occurred diastereoselectively and afforded mixtures of enantiomers. Depending on the substituents on nitriles, asymmetric atoms in both of the formed heterocyclic ligands have the same (SS/RR) or different (SR/RS) configurations
通过分子间PtII生成了一种新型的杂环,即2,3a-二取代的5,6-二氢-3aH- [1,3]恶唑并[3,2-b] [1,2,4]恶二唑恶唑啉N-氧化物C(Me)2CH2OC(R)= N +(O-)(R = Me,Et)和配合物中的配位腈之间的介导的1,3-偶极环加成(1,3-DCA)顺式-[PtCl2(R'CN)2] [R'= Me,Et,CH2Ph,Ph,N(C5H10)]。对于游离的RCN和恶唑啉N-氧化物,该反应是未知的,但是在PtII介导的条件下,反应平稳进行(CH2Cl2,20-25摄氏度,18-20h),得到纯络合物[PtCl2 N = C(R' )ONC(R)OCH2CMe2} 2] [R / R'= Me / Me,1; Me / Et,2;Me / CH2Ph,3;我/ Ph,4;Me / N(C5H10),5;Et / Me,6;Et / Et,7;Et / CH2Ph,8;Et